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Pulse stretching and shape control by compound feedback in a Q-switched ruby laser

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3 Author(s)
Lovberg, R. ; University of California-San Diego, La Jolla, CA, USA ; Wooding, E. ; Yeoman, M.

Feedback control is employed to stabilize the output of a Q -switched ruby laser. A computational model of the rate equations plus feedback terms is used to examine pulse shapes with changing feedback parameters. It is shown that a lengthened flat-top pulse cannot be obtained with negative feedback alone, a compound feedback arrangement is suggested to facilitate this. A practical laser system is constructed with an associated feedback loop, good agreement is found between theory and experiment. Pulses flat to within ±5 percent are obtained with durations up to 600 ns and are amplified with no apparent saturation. Output powers of 15 MW are achieved for hundreds of nanoseconds with a divergence of 7 mrad and a spectrum consisting of transform-limited lines separated by the axial mode spacing.

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Quantum Electronics, IEEE Journal of  (Volume:11 ,  Issue: 1 )